On 2009-09-23, exar...@twistedmatrix.com <exar...@twistedmatrix.com> wrote: > On 08:16 pm, sajmik...@gmail.com wrote: >>On Wed, Sep 23, 2009 at 2:05 PM, <exar...@twistedmatrix.com> wrote: >>[snip] >>> >>>But what some Python programmers call coroutines aren't really the >>>same as >>>what the programming community at large would call a coroutine. >>> >>>Jean-Paul >> >>Really? I'm curious as to the differences. (I just skimmed >>the entry for coroutines in Wikipedia and PEP 342, but I'm not >>fully enlightened.) > > The important difference is that coroutines can switch across > multiple stack frames. Python's "enhanced generators" can > still only switch across one stack frame - ie, from inside the > generator to the frame immediately outside the generator.
Good point. Being unable to "yeild" from inside a function called by the "main" coroutine can be limiting once you try to do something non-trivial. I had read about that limitation, but had forgotten it. Some "stackless" threading schemes for C (e.g. Protothreads http://www.sics.se/~adam/pt/) have the same issue, and it does require some extra effort to work around that limitation. -- Grant Edwards grante Yow! I have accepted at Provolone into my life! visi.com -- http://mail.python.org/mailman/listinfo/python-list
